Starting And Generating Dynamo Patents (Class 290/46)
  • Patent number: 5012177
    Abstract: Prior power conversion system operable in generating and starting modes have utililzed brushless generators which are suitable for only certain applications. In order to overcome this problem, a power conversion system operable in generating and starting modes utilizes a switched reluctance motor/generator which is reliable and inexpensive and which can be used in a variety of environments.
    Type: Grant
    Filed: December 19, 1989
    Date of Patent: April 30, 1991
    Assignee: Sundstrand Corporation
    Inventors: P. John Dhyanchand, Sunil Patel, Chai-Nam Ng, Vietson Nguyen
  • Patent number: 5001412
    Abstract: A dual purpose alternator starter for an automotive vehicle designed to be positioned between the engine and transmission. In place of the ring gear in a conventional drive train assembly, a pair of off set magnetically permeable discs are bolted to the power shaft. These discs form an annular channel between them. A plurality of rare earth permanent magnets are mounted on the inside face of one of the discs in the channel. On the opposite side of this disc, a set of ring shaped switch contact members are mounted. Positioned stationary to the engine and within the channel is a stationary ironless stator assembly having flat copper windings embedded in an insulation matrix. These windings alternately pass from the perimeter of the disc towards the interior of the disc as each winding forms a single pass around the ring shaped disc.
    Type: Grant
    Filed: September 2, 1988
    Date of Patent: March 19, 1991
    Assignee: Chrysler Corporation
    Inventors: Ivor W. Carter, Frederick W. Crall
  • Patent number: 4982123
    Abstract: The problem of providing field power to a stationary main generator rotor is addressed such that it can be used as a synchronous or brushless dc motor. To that end, a dynamoelectric machine performs the dual-functions of an exciter generator and a rotating transformer integrated into a single unit (14). The heads (64) of the stator salient poles (60) include pole slots (68) for a primary transformer winding (34) for the rotating transformer, while the rotating armature winding (36) serves as the transformer secondary. To assist in starting the engine (10), external ac power (42) is applied to the primary transformer windings (34), coupled to armature windings (36), and rectified (44) to develop dc field power for the main generator (12).
    Type: Grant
    Filed: November 17, 1989
    Date of Patent: January 1, 1991
    Assignee: Sunstrand Corporation
    Inventor: Bernard A. Raad
  • Patent number: 4968926
    Abstract: A power conversion system is operable in a generating mode to convert motive power developed by a prime mover into electrical power and in a starting mode to convert electrical power developed by a source of AC power into motive power for starting the prime mover. The system includes a stepped waveform inverter having a plurality of subinverters that are operable in the generating mode to produce rectangular waveforms wherein the waveforms are summed by a summing transformer to produce a stepped AC output waveform. During operation in the starting mode, the output of a rectifier bridge and an input of one of the subinverters are connected together by an interphase transformer. DC power is developed at a mid-tap of the interphase transformer and is delivered to the remaining subinverters which in turn develop AC power for operating a brushless generator as a motor.
    Type: Grant
    Filed: October 25, 1989
    Date of Patent: November 6, 1990
    Assignee: Sundstrand Corporation
    Inventor: P. John Dhyanchand
  • Patent number: 4959595
    Abstract: A starter-generator of an automobile is disclosed which comprises a stationary field coil wound and disposed coaxially around the rotational axis. The rotor comprises a pair of field pole forming members on which circumferentially alternating field poles are excited by the magnetic flux generated by the field coil. Armature coils connected in Y-connection are disposed around the rotor, and the terminals of the armature coils are coupled to the inputs of a three-phase rectifier circuit (used when the starter-generator acts as a starting motor) and the outputs of a armature current switching circuit (used when the starter-generator acts as a charging generator) which controls the flow of current through the armature coils so that a rotating magnetic field is formed. The starter-generator further comprises a pair of auxiliary coils which are wound and disposed around the rotational axis at both sides of the armature in the neighborhood of the rotor.
    Type: Grant
    Filed: January 18, 1989
    Date of Patent: September 25, 1990
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventor: Shinji Nishimura
  • Patent number: 4948997
    Abstract: Disclosed are a starter and power generator which starts an engine and which is subsequently driven by the engine to generate power, and a motor used in the starter, in particular, a self-controlled commutatorless motor in which a rotating magnetic field is developed across the stator in accordance with an angle of rotation of the rotor. Normally, output matching means is connected to the three phase windings of the stator, whereby an alternator is defined by the combination of the rotor, the stator and the output matching means. However, in response to a starting command, energizing means is substituted for the output matching means, whereby a combination of the rotor, the stator, timing means and energizing means form a commutatorless motor. Thus, subsequent to starting the engine, the motor is driven by the engine to generate power.
    Type: Grant
    Filed: September 7, 1988
    Date of Patent: August 14, 1990
    Assignee: Aisin Seiki Kabushiki Kaisha
    Inventors: Takashi Ohmitsu, Tsutomu Mitsui
  • Patent number: 4948209
    Abstract: A variable speed, constant frequency starter generator system is provided with a dynamoelectric machine, electrically connected to a multiple-phase bus and pair of multiple-phase rectifiers for producing a DC voltage on a pair of link conductors. An inverter converts the DC voltage to floating AC voltage which is further converted to a ground-referenced AC voltage by a transformer. During generator operation, the output voltage of the machine is rectified by at least one of the rectifiers to produce a DC voltage on the link conductors which is converted to a constant frequency AC voltage by the inverter. During starter operation, an externally supplied AC voltage is applied to the transformer. The transformer converts the externally applied AC voltage to a pair of phase-displaced AC voltages which are rectified by the pair of multiple phase rectifiers to produce twelve-pulse rectified DC voltage on the link conductors. This reduces the harmonic content of the current supplied by the external power source.
    Type: Grant
    Filed: January 1, 1989
    Date of Patent: August 14, 1990
    Assignee: Westinghouse Electric Corp.
    Inventors: Donal E. Baker, Jack W. Ogden
  • Patent number: 4947100
    Abstract: A power conversion system is operable in a generating mode to convert motive power developed by a prime mover into electrical power and in a starting mode to convert electrical power developed by a source of AC power into motive power for starting the prime mover. The system includes a rectifier having an output coupled to a DC link, first and second inverters, each coupled to the DC link and transformer including first and second sets of primary windings and a set of secondary windings wherein the second set of primary winding is coupled to an output of the second inverter. Contactors are provided for coupling the rectifier to the generator armature windings and the first set of primary windings to an output of the first inverter so that AC power produced by the generator is converted into DC power on the DC link and the DC power is converted into fixed frequency AC power which is developed in the set of secondary windings.
    Type: Grant
    Filed: October 16, 1989
    Date of Patent: August 7, 1990
    Assignee: Sundstrand Corporation
    Inventors: P. John Dhyanchand, Vietson Nguyen
  • Patent number: 4939441
    Abstract: An excitation system for a brushless generator includes an exciter portion having a set of polyphase exciter field windings and an additional exciter field winding disposed in a stator of the generator, a source of polyphase, constant-frequency AC power and circuitry coupled to the set of polyphase field winding for connecting the source of polyphase, constant-frequency AC power thereto at a beginning of operation in a starting mode whereby AC power is induced in an exciter portion armature winding by transformer action. AC power is further provided to armature windings of a main generator portion to thereby cause a rotor of the generator to accelerate. An autotransformer is provided to reduce the voltage provided by the source of polyphase AC power prior to application of such power to the polyphase field windings so that the need for an auxiliary inverter is obviated.
    Type: Grant
    Filed: October 27, 1989
    Date of Patent: July 3, 1990
    Assignee: Sundstrand Corporation
    Inventor: P. John Dhyanchand
  • Patent number: 4922119
    Abstract: A starting system for an aircraft propulsion engine. An electrical motor (62 or 122) is mounted within a case (14) in which first and second hydraulic units (102, 104) are operated as part of a constant speed drive transmission. The electric motor accelerates a motor-generator set (24) to a velocity near the synchronous speed. The motor-generator set is coupled to the drive shaft (20) by operation of the hydraulic units as a variable torque link. The electric motor functions both as a heat source of hydraulic fluid contained within the hydraulic pump and motor case during extreme low temperature conditions at which point the starting torque of the motor is initially insufficient to cause rotation of the output shaft and to further accelerate the motor-generator set up to a rotational velocity at which the motor-generator set may be operated synchronously at which the motor-generator set is coupled to the drive shaft (120) by operation of the hydraulic units as a variable torque link to rotate the engine.
    Type: Grant
    Filed: November 29, 1988
    Date of Patent: May 1, 1990
    Assignee: Sundstrand Corporation
    Inventors: Bernard A. Raad, Tyrone A. Johnsen
  • Patent number: 4918323
    Abstract: A field core and an armature core are directly mounted on a cylinder block, and a clutch plate frictionally connected with a clutch disc is mounted through a cushioning material to a revolving-field poles mounted on the engine crankshaft, so that a space will be provided between the clutch plate at this frictionally connected area and the revolving-field poles, thereby insulating by the space the frictional heat at the clutch plate connection area caused by clutch connection and disconnection, thus restraining temperature rise of the revolving-field poles, and preventing deformation and damage of the revolving-field poles. The cushioning material has an effect to absorb various types of vibrations occurring with connection and disconnection between the clutch plate and the clutch disc.
    Type: Grant
    Filed: October 6, 1988
    Date of Patent: April 17, 1990
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventor: Hiroaki Aso
  • Patent number: 4908540
    Abstract: An electric generator organization, particularly adapted for small vehicles such as motorcycles, is described in which a rectifier mechanism electrically disposed between the stator and the rotor is mechanically connected to the rotor for rotation therewith during engine startup and disconnected therefrom during periods of normal engine operation. An operating circuit enables efficient transmission of electric current from the battery to starting coils in the generator only during the period of engine startup. During periods of normal engine operation, the transmission of electric current is from generating coils in the generator to the battery. Included in the operating circuit is an engine operation detector that prevents excessive current feed from the generator coils to the rectifier mechanism.
    Type: Grant
    Filed: October 12, 1988
    Date of Patent: March 13, 1990
    Assignee: Honda Giken Kogyo Kabushiki Kaisha
    Inventors: Shoji Motodate, Nobuaki Komuro, Yukio Miyamaru
  • Patent number: 4894553
    Abstract: A field coil is divided into the plural number, and each of these field coils is connected in parallel in relation to a battery at the time of engine starting, and in series during the generation of the electric current after engine starting, so that sufficient field electromotive force can be maintained in the event of a battery voltage drop during engine starting, and also a necessary, sufficient field electromotive force can be produced with little current at the time of voltage recovery during generator operation. Consequently, the amount of copper to be used for the field coils and a winding space can be decreased; therefore the present invention is effective to provide a light-weight, small and unexpensive engine starting and charging device.
    Type: Grant
    Filed: October 6, 1988
    Date of Patent: January 16, 1990
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventor: Kazutoshi Kaneyuki
  • Patent number: 4868754
    Abstract: An initial start-up schedule is prepared based on given parameters relating to a thermal power plant and its operation. A dynamic characteristic model is prepared, permitting simulation of start-up characteristics which would be obtained if the thermal power plant is started according to the initial start-up schedule. Estimates are made of specified parameters, such as energy loss, the time interval between steam admission to an intermediate pressure turbine and steam admission to a high pressure turbine, and thermal stress of the power plant. Determination is made of whether the estimated values of the selected parameters are within predetermined allowable ranges or not. The initial start-up schedule is then corrected according to a predetermined rule depending upon whether the estimated values are determined to be within the predetermined allowable ranges or not. The estimating, determining, and correcting are repeated until an optimized start-up schedule is obtained.
    Type: Grant
    Filed: April 2, 1987
    Date of Patent: September 19, 1989
    Assignee: Hitachi, Ltd.
    Inventor: Hiroshi Matsumoto
  • Patent number: 4853554
    Abstract: A starting device for an automobile motor in which an asynchronous motor (23) is used both as starting motor and generator. A number of solid state switches (10), forming part of an inverter, is arranged on a metal bar (7) extending along the stator (4) of the motor. The metal bar is connected to one terminal of a voltage supply (21). The stator conduits (9) are connected to a solid state switch and to the other terminal of the voltage supply.
    Type: Grant
    Filed: January 22, 1985
    Date of Patent: August 1, 1989
    Assignee: Institut Cerac S.A.
    Inventors: Carl S. M. Hartwig, Sven H. Johansson
  • Patent number: 4841216
    Abstract: An AC exciter and a main AC generator are mounted on a common rotating shaft of an engine, and a power rectifier and a power inverter are connected in series to the output of the main AC generator. In starter mode, an external AC power source is connected by a switch to the input of the power rectifier, and the output of the power inverter is applied to an armature winding of the main AC generator to drive it as a nocommutator motor to start the engine. A permanent magnet AC generator is also mounted on the common shaft of the engine to provide DC excitation to the AC exciter after converting the output of the permanent magnet AC generator into DC current, and the output of the permanent magnet AC generator is further utilized to detect the rotational speed of the engine to control the switch.
    Type: Grant
    Filed: May 20, 1988
    Date of Patent: June 20, 1989
    Assignee: Shinko Electric Co., Ltd.
    Inventors: Yoshimi Okada, Masao Kimura, Kazuo Okubo
  • Patent number: 4830412
    Abstract: A starting system and method for starting a prime mover connected to a generator by an actuable torque link utilizes a hybrid permanent magnet/induction machine having a rotor coupled to a rotor of the main generator and a stator having windings therein. The method includes the step of applying AC power to the hybrid machine stator windings so that the hybrid machine initially acts as an induction motor to accelerate the hybrid machine rotor, following which the hybrid machine acts as a synchronous motor to rotate the main generator rotor at a particular speed DC power is then applied to a main generator field winding and AC power is supplied to a set of main generator armature windings so that the main generator operates as a synchronous motor to develop motive power the torque link is activated once the main generator is operating as a synchronous motor to bring the prime mover up to self-sustaining speed.
    Type: Grant
    Filed: November 30, 1987
    Date of Patent: May 16, 1989
    Assignee: Sundstrand Corporation
    Inventors: Bernard A. Raad, Clarence F. Dolan
  • Patent number: 4797602
    Abstract: A unitary starter motor and generator including a rotor assembly having a plurality of circumferentially disposed rare earth-iron permanent magnets, a stator assembly within which said rotor assembly is rotatable, said stator assembly including a laminated annular stator body formed from a silicon containing iron alloy of high electrical resistivity and low magnetic loss, and a multiphase stator winding secured to the inner periphery of said stator body and lying in the airgap defined between the stator body and the rotor assembly.
    Type: Grant
    Filed: February 12, 1987
    Date of Patent: January 10, 1989
    Assignee: Lucas Industries Public Limited Company
    Inventor: John G. W. West
  • Patent number: 4772802
    Abstract: Prior starting/generating systems which operate a generator as a motor to start a prime mover have been inefficient since motive power was delivered to the prime mover through hydrostatic trim and differential components of a constant speed drive interposed between the prime mover and the generator. In order to overcome this problem, means are provided between the prime mover and the generator for bypassing these components of the constant speed drive when operating in a starting mode so that motive power is transferred directly to the prime mover. This, coupled with the fact that the generator is operated as a motor responsive to generator speed and/or generator power factor, increases the efficiency of the system when in the starting mode.
    Type: Grant
    Filed: August 19, 1987
    Date of Patent: September 20, 1988
    Assignee: Sundstrand Corporation
    Inventors: Timothy F. Glennon, Richard W. Reynolds, Wayne A. Flygare, Paul Baits, Ogbonna C. Wambu
  • Patent number: 4754154
    Abstract: An electric generator for vehicles is disclosed including an armature having starting coils, generating coils and a starting current supply path assembly for supplying electrical current from a power supply to the starting coils. The electric generator also includes a field element having a set of field magnets for providing a magnetic field which interacts with the magnetic field of the starting coils during a start-up sequence of the engine of the vehicle. The field magnets also generate a magnetic field after the start-up sequence has been completed to induce an electrical current in the generating coils during operation of the engine so as to provide electrical energy for the engine. The starting coils are arranged concentrically inside the set of field magnets and the generating coils are arranged concentrically inside the starting coils.
    Type: Grant
    Filed: September 2, 1986
    Date of Patent: June 28, 1988
    Assignee: Honda Giken Kogyo Kabushiki Kaisha
    Inventor: Shoji Motodate
  • Patent number: 4743776
    Abstract: Inefficiencies in electrical starter-generator systems for turbine engines are avoided in a construction including a dynamoelectric machine 16 operable as a motor or as a generator and having a rotor 26, a hydraulic torque converter 70 including an impeller 80 connected to the rotor 26 and a turbine 86. A system 94, 96 is provided for selectively providing hydraulic fluid to the torque converter 70 and a constant speed drive 112, 142, 144 is included. Overrunning clutches 108 and 158 interconnect the turbine 86 and an input for the constant speed drive for allowing the input to overrun the turbine 86 but not the reverse, and for interconnecting the rotor 26 and an output 130 of the constant speed drive for allowing the rotor 26 to overrun the output 130.
    Type: Grant
    Filed: September 2, 1986
    Date of Patent: May 10, 1988
    Assignee: Sundstrand Corporation
    Inventors: Thomas Baehler, Victor Benson, Wayne Flygare
  • Patent number: 4743777
    Abstract: A starter generator system is provided with a dynamoelectric machine having a stator and a rotor which is mounted for rotation with respect to the stator. The rotor carries a main field winding, an exciter armature winding and means for rectifying the output of the exciter armature winding to provide DC excitation for the main rotating field winding. A main armature winding is mounted on the stator and magnetically coupled to the main field winding. An exciter portion of the stator supports both a multiple phase AC exciter field winding and a distributed DC exciter field winding, both of which are mounted to be magnetically coupled to the exciter armature winding. A variable voltage, variable frequency power converter is capable of being alternatively connected to drive the dynamoelectric machine as a starting motor or to receive power from the machine during generator operation.
    Type: Grant
    Filed: March 7, 1986
    Date of Patent: May 10, 1988
    Assignee: Westinghouse Electric Corp.
    Inventors: William J. Shilling, Donal E. Baker
  • Patent number: 4734590
    Abstract: An integrated drive generator system in which all of the main components of the system are mounted for operation about a single centerline. A housing mounts a drive input shaft. A differential is coupled to and arranged coaxially of the drive input shaft. A generator is coupled to the differential and includes a rotor coaxially of the drive input shaft. A hydraulic log includes a hydraulic pump and motor assembly coupled to the differential and arranged coaxially of the drive input shaft. An exciter also is employed coaxially of the drive input shaft, surrounding the differential, and a compact cooling system includes cooling passages integral with the housing and in close proximity to the stator of the generator.
    Type: Grant
    Filed: December 30, 1986
    Date of Patent: March 29, 1988
    Assignee: Sundstrand Corporation
    Inventor: Theodore D. Fluegel
  • Patent number: 4704552
    Abstract: An electrical machine comprising a stator having electrical windings and a permanent-magnet rotor which carries a shaft arranged for connection to a prime mover. The machine, when the shaft is driven by a prime mover, acts as an alternator to produce alternating electrical current. A commutator is provided on the shaft and electrical-current-transferring brushes are associated with the commutator. Means is electrically associated with the segments of the commutator and with the electrical windings on the stator so that, whe the brushes are connected to a source of direct electrical current, the machine acts as a motor and the shaft is caused to rotate for starting a prime mover connected to the shaft.
    Type: Grant
    Filed: August 5, 1985
    Date of Patent: November 3, 1987
    Assignee: Dowty Fuel Systems Limited
    Inventor: John M. Masterman
  • Patent number: 4684814
    Abstract: A starter/generator in combination with a dual battery dual voltage motor vehicle electrical system and an equalization circuit for maintaining substantially equal charge on the batteries. In starting, the starter/generator is operated as an equivalent series motor from the serial combination of the two batteries to crank the engine. Upon starting, the starter/generator supplies charging current at one or the other of the system voltages, depending on the engine speed. At all times, the equalization circuit transfers energy from one battery to the other as required to maintain balanced battery voltages.
    Type: Grant
    Filed: July 3, 1986
    Date of Patent: August 4, 1987
    Assignee: General Motors Corporation
    Inventor: Thomas A. Radomski
  • Patent number: 4507565
    Abstract: Described is a method of starting an electric starting motor for an internal combustion engine. The motor shaft has a pinion at the shaft end for meshing with a ring gear provided to the engine. The pinion is shifted by a shift lever into a position meshing with the ring gear, after which the starting motor is excited for causing rotation of the ring gear and thereby starting the engine. According to the invention, until the time the pinion engages the ring gear, brush means of the starting motor are shifted away from the electrically neutral axis towards pole sides of the permanent magnet of the motor where the main magnetic field produced by the magnet is strengthened by the armature-reaction magnetic fluxes. After the pinion is engaged with the ring gear, said brush means are returned again to their positions on said neutral axis.
    Type: Grant
    Filed: May 12, 1983
    Date of Patent: March 26, 1985
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventor: Isao Hamano
  • Patent number: 4506162
    Abstract: To permit manufacture of starter components with substantial tolerance, while maintaining the axial play of the armature of the starter within tight tolerances, and permit adjustment of the tolerance of the axial play after assembly of the starter component together, an end face (33) of the shaft (4) projects beyond the respective end bearing, which is retained a housing projecting beyond the bearing by the distance of an adjustment plug (29) slightly smaller than the longest shaft--in the light of tolerances--of the starter. An axial play compensation spacer in form of a washer or disc (FIG. 2--35), a ring (FIG. 3--35a) or a centrally held ball (FIG. 4--35b) is placed between the end face (36) of the plug and the end face (33) of the shaft, the plug being formed with an abutment surface (31) which engages an engagement surface (32) at the outside of the housing adjacent the bearing.
    Type: Grant
    Filed: April 4, 1983
    Date of Patent: March 19, 1985
    Assignee: Robert Bosch GmbH
    Inventors: Klaus Bolenz, Franz Liedl
  • Patent number: 4506163
    Abstract: A starter motor housing comprising a tubular housing formed by an annular wall having a thickened wall portion adjacent the stator winding of the starter motor. The stator cores abut against and are secured to the inner periphery of the thickened wall portion to increase the flux path and, thus, the effective flux energy produced by the stator windings. However, the thickened wall portion is disposed intermediate radially reduced wall end portions to reduce the weight and size of the motor housing. Preferably, the tubular housing is an iron casting.
    Type: Grant
    Filed: April 21, 1983
    Date of Patent: March 19, 1985
    Assignee: Teledyne Industries, Inc.
    Inventor: Julius J. Stevens
  • Patent number: 4488054
    Abstract: A starter apparatus comprises a D.C. motor, a solenoid actuator, a hollow sleeve having at one end thereof a pinion and a one way clutch. A torque of an armature of the D.C. motor is transmitted through the one way clutch to the hollow sleeve and further transmitted to a ring gear of an engine, which is engaged with a pinion of the hollow sleeve, thereby performing a start up of the engine. The engagement or disengagement between the pinion and the ring gear is carried out by means that the solenoid actuator reciprocates only the hollow sleeve through a shift lever.
    Type: Grant
    Filed: April 12, 1983
    Date of Patent: December 11, 1984
    Assignee: Hitachi, Ltd.
    Inventor: Kohei Ebihara
  • Patent number: 4481459
    Abstract: A power conversion system for converting between electric and motive power may be utilized either in a generating mode to generate electric power from motive power supplied by a prime mover or in a starting mode wherein motive power is developed by the power conversion system from electrical power and is supplied through a torque converter to the prime mover to start same. The power conversion system includes a main generator, an exciter and a permanent magnet generator, or PMG, which together comprise a brushless alternator. When operated in the starting mode, power is supplied to the PMG to cause it to act as a motor and thereby drive a rotor which is common to the PMG, exciter and main generator. Once a predetermined operating condition of the generator is attained, the main generator is supplied power from a motor control to cause the generator to act as a synchronous motor and the power supply to the PMG is disconnected.
    Type: Grant
    Filed: December 20, 1983
    Date of Patent: November 6, 1984
    Assignee: Sundstrand Corporation
    Inventors: Byron R. Mehl, Raymond N. Olson, Timothy F. Glennon
  • Patent number: 4459536
    Abstract: The same electrical machine geared to the fly-wheel of a vehicle engine serves as the starter and as the generator. This machine is excited by permanent magnets on a rotor and its stator is wound with two phase windings offset from each other by 90.degree. electrical. Half-bridge rectifiers are utilized in a circuit cooperating with the center tap of each winding for charging the battery in generator operation, cooperating with a unit including at least one MOSFET for regulating the charging current. In motor operation the winding center taps are connected to one pole of the battery and the common connection of the MOSFETs is connected to the other pole of the battery so that these devices can operate as d.c. to a.c. converter elements for providing pulses in proper sequence to the erstwhile generator to make it operate as a motor.
    Type: Grant
    Filed: August 13, 1982
    Date of Patent: July 10, 1984
    Assignee: Robert Bosch GmbH
    Inventor: Rainer Wirtz
  • Patent number: 4330743
    Abstract: This invention relates to electrical aircraft engine start and generating system for use in an aircraft having an engine driven torque converter coupled to an alternator which provides AC power for conversion to DC and AC power. The system includes a reversible AC to DC converter controllably electrically coupled to the alternator and a controller unit to provide DC power in a generating mode. The reversible AC to DC converter is capable of receiving externally supplied DC power to be converted to AC power to drive the alternator as a motor in a start mode. A DC to AC converter is controllably electrically coupled to the controller unit and the DC power output during the generating mode. The reversible DC to AC converter in the start mode is mutually controllably electrically coupled to the externally supplied DC power.
    Type: Grant
    Filed: July 17, 1980
    Date of Patent: May 18, 1982
    Assignee: Sundstrand Corporation
    Inventor: Timothy F. Glennon
  • Patent number: 4219739
    Abstract: A starter-motor, and alternator-generator apparatus for an internal combustion or gas turbine engine wherein the major electro-magnetic circuit of the apparatus is utilized for both the starting and generating functions is disclosed. The rotor may have two windings on it, a main rotor winding that acts as both a starter armature winding and an alternator field winding, and a small exciter armature winding. For slip ring machines the exciter is eliminated. The main rotor winding is wound in progressive simplex lap. The exiter armature or slip rings are connected to this winding at the equalizer connections through a rectifier and automatically activated switch circuit. During starter-motor operation, the main rotor winding is connected in series with its starter field winding through a commutator in a conventional series connected DC machine, and the exciter-armature winding or slip rings are disconnected from the main rotor winding.
    Type: Grant
    Filed: April 27, 1978
    Date of Patent: August 26, 1980
    Assignee: Lear Avia Corporation
    Inventor: Jack E. Greenwell
  • Patent number: 4122354
    Abstract: An internal combustion engine starting circuit for a system including a combination direct current motor generator unit having an armature coil and field coil in series therewith to be connected to a source of direct current to function as a starter motor when the ignition switch is first closed and to function as a generator when the internal combustion engine starts to bring the motor generator unit to generating speed is provided with a starting solenoid to be energized to close a contact for connecting the motor generator unit to the source when energized. An ignition switch is adapted to be closed to complete a circuit through one coil of a double coil starting relay having a normally open contact to be closed to energize the starter solenoid in series with the ignition switch and the source.
    Type: Grant
    Filed: April 6, 1977
    Date of Patent: October 24, 1978
    Assignee: Thermo King Corporation
    Inventor: Leland L. Howland
  • Patent number: 4093869
    Abstract: Method and apparatus for accelerating a large inertia load from rest to a predetermined speed of rotation by means of a synchronous dynamoelectric machine. A synchronous dynamoelectric machine, such as a turbine generator, which is mechanically coupled to a gas turbine prime mover, is started synchronously to bring the gas turbine up to a speed which exceeds its stall speed under load. The rotor field winding of the synchronous dynamoelectric machine is connected to receive direct current excitation from a rotatable rectifier assembly of a brushless exciter. During starting, a quadrature axis winding disposed around the stator of the brushless exciter is energized by single phase alternating current. Alternating current excitation is induced by transformer action within the rotor armature winding of the exciter and is applied to the rotor field winding after being rectified by the rotatable rectifier assembly.
    Type: Grant
    Filed: April 13, 1976
    Date of Patent: June 6, 1978
    Assignee: Westinghouse Electric Corp.
    Inventors: Arthur H. Hoffmann, Dale I. Gorden, Lee A. Kilgore
  • Patent number: 4010377
    Abstract: A power system comprising a generator mounted on the propulsion unit of an outboard motor through an interposed adaptor which exposes the drive connection between the generator and propulsion unit to allow access thereto for employment of the drive mechanism for the driving of accessories other than the outboard motor. Clutch means selectively couple the drive means of the generator and the driven means of the propulsion unit for a selective operation of the mounted generator independently of the propulsion unit.
    Type: Grant
    Filed: February 20, 1975
    Date of Patent: March 1, 1977
    Inventor: James W. McKenzie
  • Patent number: 3937974
    Abstract: The instant invention describes an improvement in a starter-generator arrangement in which a dynamoelectric machine is driven as a brushless DC motor to start a dynamic load such as a jet engine and as a cynchronous constant frequency generator after the jet engine is ignited and brought up to speed. A plurality of cycloconverters utilizing phase controlled rectifier banks are operated from a constant frequency supply source to supply current to the armature windings of the machine in the starting mode. Position sensing elements such as Hall generators sense the rotor position relative to the machine windings and generate enabling signals to control conduction of the phase controlled rectifiers to supply current to the proper armature windings so that the machine functions essentially as a DC brushless motor to drive a dynamic load such as a jet engine.
    Type: Grant
    Filed: August 30, 1974
    Date of Patent: February 10, 1976
    Assignee: General Electric Company
    Inventor: David Logan Lafuze